Sand-mixing machine



R. C. STKES.

SAND MIXING MACHINE.

APPUCATIUN meu SEPT.22.`19 9.

1,337,373, Patented Apr. 2o, 1920.

2 SHEETS--SHEET l.

H. C. SOKES.

SAND MIXING MACHNE. APPLicArlon mw sim. 22, 19|9.

Patented Apr. 20, 1920.

2 SHEETS-SHEET 2.

RUSSELL C. STORES, OF PORTLAND, OREGON.

SAND-MIXING MACHINE.

Specification of Letters Patent.

Patented Apr. 20, 1920.

Application filed September 22, 1919. Serial No.v 325,415,

To atl who/n t 'may concern:

Be it known that I, Rossem. (l. S'ronns, a citizen of the United States, residing at Portland. in the county lof Multnomah and State of Oregon, have invented a new and useful Improvement in Sand-Mixing Machines, of which the following is a specification, referente being had to the accompanying drawings.

My invention relates to a class of devices for mixing` sand which has been employed in foundry molding.

The object ol' my invention is to provide a device, by the employment of which the sand is lmeuded toward the renter of the path ot travel of the machine, and at the same time is thoroughly separated into its loose granular condition. l attain these objeets. as well as other advantages= by the construction, combination and arrangement of parts illustrated| in the accompanying drawings which forni a part hereof.

Figure l iC a side elevation of the device.

Fig. llV is a plan view with parts removed.

Fig'. lll is a rear elevation of mixer drum.

Fig. lV is an end elevation of the saine.

Figi'. V is a sectional elevation of clutch releas-.iingy lnm'hanisni related to the drum.

Fig. Vl is a sevtional view on the line Vl-Vl in Fig. Y.

Like numerals refer to like parts in the views. V

carriage T is provided with a single l'orward pivoted steeriimr wheel 8, having a steering handle i), and two rear wheels l-10. ln the rear part of the carriage, angled wheel axles 11-11 are rigidlyr secured in desired positions and upon the lower ends of these the wheels -10 are rotatably mounted. An electric motor 12 is arranged upon a fraaie 13, secured over the carriage. The motor has a drive shaft 14, from which i chain belt l5 extends to a toothed wheel 16 on a transmission shaft 18, which is rotatably mounted longitudinally of the carriage in bearings 19-19. The shaft 1S is horizontally slidable in its bear ings and has a transverse friction disk 20 rigidly secured on its rear end. A collar 21 is adjustably secured to the shaft 18 adjacent to the bearing 19 against which it rotates. Adajcent to the bearing 19 another collar 22 is secured upon the shaft 18 and rotates with the same. The collar 22 has a groove 23. A lever mechanism 24 has a fulcrum at 25, secured in the carriagejl and a pin 26 arranged to engage the collar 22 in. its groove 23. An eccentric operating handle 2T is a1'- ranged upon the earriafe fran'ie to move this lever mechanism. letween the collars a coil spring 27 is placed about the shaft 18, the ends of the spring engaging the collars and in this manner foring the shaft and its disk rearwardly. To the rear ot' the disk 2U a friction pulley 28 is rigidly secured on a transverse rotatable shaft 29 and in position to be engaged by the disk 20. The pulley 28 is keyed upon the shaft in` a manner to allow it to be slid along the shaft, in order to engage the disk in varyirn; positions. 'l`he pulley has a rigid grooved hub 30. A lever 31 is pivotally mounted in position to engr-aire the pulley 2S in its grooved hub,y in a. manner .vhereby the pulley may be moved along the shaft by the lever. rIhe shaft 29 has a worin 32 near its outer end. ',l'ransversely below the shaft 29 is a shaft 33 provided with a rigid beveled gear fil-t on one end and a worm Irear 32 below the worm 32 and in position to engage it. 0n the opposite end of the shaft 33 is a rigid pulley 35. Rearwardly from and parallel with the shaft 29 is another rotatably mounted shaft 40. Upon the inner end of said shaft is a rigid beveled Aucar Al1 in position to be engaged by the gear 3l. A toothed wheel l2 is mounted in clutch mechanism ou the outer part of this shaft in a manner whereby the wheel may be thrown into engagement with the sha ft to cause it lo rotate and be released from rotating engagement, on the shaft. The clutch mechanism operated by the lever means 43. A toothed wheel 44 is rigidly secured to the trartor wheel 10 and a eliain belt 45 extends about the wheels 4:2 and 44. y

Angled drum supports 46h46 are pivotally mounted at their forward ends on the wheel axle supports, where shaft formed adjacent to the carriage frame. The supports 46-46 have a drum shaft 17 pivoted in their angles, upon which a drum 4.8 is riufidli7 mounted. On the lower ends of the drum supports 4(3-46 small drum carrying Wheels 49 are rotatably mounted in adjustable means 49. The drum is provided with rigid helical blades 50 on each end. The drum has a series of transverse bars 51 secured to drum spiders 48a and to these bars 51' are hinged the bars 52 which are provided with fingers 5B. The centralparts of the bars 52 have arms 54 and springs 55 conuecting the same to opposing bars 51.

llpon one end ot' the `drum shaft a power gear wheel 56 is rotatably mounted. Upon the shaft 47, and ad'acent to the wheel 56, rlutr'h mechanism 5 is arranged, with a spring 5H to retain the clutch in engagement and lever means 5l) to release it from engagement with the wheel 56. A pin errtenls into a socket of the lever means and its opposing end is in a position wherein the bars 52.. may engage the pin 60 when the bars are pressed by obstacles beyond the desired distance, and force the pin into the socket and actuate the lever means to release the clutch. A spring 6l retains the pin out` of engagement with the clutch lever means at othertimcs. This clutch and lever means are shown in Figs. V and VI.

In alinement with the shaft 29 another shaft G2 is rotatably mounted and has upon it a 'friction pulle 63 in a position to be engaged by the disk 20, the pulley being keyed upon the shaft in a manner to allow it to be slid along the same, in order to enga fe the disk in varying positions. The

pu ley 63 has a rigid grooved hub 64. A lever G5 is pivotally mounted in a position to engage the grooved hub in a manner whereby the pulley ma be moved along the shaft byfthe lever. ear the opposite end of the shaft a gear 66 is rigidly secured. Rearwardly from the shaft 62 another transverse shaft 67 is rotatably mounted. Upon this shaft is a gear 68 and a drive chain 69 extends about the gears`66 and 68. On the opposite end oi' the shaft 67 a gear 7U is rigidly secured. Adjacent to the support 46 and upon the upper shaft formed end of the axle 1l is a rotatable sleeve '7lv to which a gear 72 is rigidly secured. A drive chain 73 extends about the gears 70 and 72. Adjacent to the gear 72 another gear 72' is rigidly secured upon the sleeve 7l. A drive chain 74. extends about the gears 56 and 73.

Above the motor a reel. 75 is rotatably mounted on a shaft 7G provided with a pulley 77. A. belt 77 extends about the pulleys 35 and 77. An electric cable 78 extends from a power source to the motor and is wound upon the reel as the machine ad` vaneesdn the direction. of the power source. A guard 79 extends rearwardly over the drum. Lines 80 are connected at their lower ends to the drum supports 46 and extend upwardly to and through hoisting mechanisni 8l which is operated by the rod S2 through the related worm and gear when it is desired to adjust the height of the drum above the path of travel of the machine.

lt will now be seen that ywhen electric power is transmitted to the motor l2 this power is transmittcf' through the intervening mechanism to the tractor wheel l0, the

arrangement of the gears providing for a fingers and other mechanism.

moderate speed of the machine over its path of travel. Also, the traction power bein applied to one wheel only, obviates the nee of differential rearing required for a two tractor drive. he machine being arranged with one forward steering wheel and one tractor 1wheel drive, allows it to be turned in a less radius or pivotal center than a four wheel carriage. It will be further yseen that power is transmitted from the motor through intervening mechanism to the drum and this mechanism is arranged to provide a high speed in the drum revolutions. The helical drum blades lmead the sand inwardly toward the center as the ina-- chine straddles a ile of sand, from which foundry castings iave been removed. The fingers of the drum enter the sand thus kneaded and thoroughly develop it into loose granular condition adapted for renewed use in moldin or casting. The sand is thus broken up an mixed far better than is done b machines equipped with cutting blades on y. Tho fingers in my device also cast the sand rearwardly in the path oi. travel in this same i granular condition, which result has not heretofore been attained. The mechanisms for shifting the friction pulleys 28 and 63 on the friction disk 20 a low a wide range of speeds for the traction and the drum, which is highly ustful, whereas in other known devices not more than two ri' fidly pre-determined speeds are attainable. he series of mixing lingers are hinged and given resiliency by the bar holding springs which prevents the lingers from breaking when meeting unusual resistance. The automatic mechanism which releases the drum from operative movement vis provided for cases Where the fingers strike an obstacle which they can not pass or throw aside. This prevents injury tov the The helical. blades also insure a rigid piling of the sand. They require less power to cause their helical movement through the sand than blades arranged only to stir or agitato it with the consequent resistance thereby to be overcome. y

It will be apparent also that the hoisting means for the drum permits the drum to be adjusted at a convenient height above the path of. travel and secured there, either While the machine is mixing sand orbeing,

moved away from it. Mechanism is also provided to stop the tractor wheel at any time, while the drum continues to be rotated. The reel mechanism is arranged in connection with the traction transmission in order that the power cable may be picked up with relation to the speed of travel of the machine. It will also bc seen that means are provided to release the friction disk and stop the transmission of power to both tractor wheel and drum. The guard is provided to prevent sand being thrown forwardly upon the mechanisms. The mechanf or changing the positions of the frictihn pulleys on the friction disk, amply provides an eilicient means to radual y increase or decrease the speed o the drum or the tractor, and obviates jolting, sudden movement or stoppage, which feature is of great importance in sand mixers.

The drum supporting wheels are adjustable, by the means shown, in a manner to retain the drum at a desired height over the travel path. The drum also being ivotally mounted on its supports, this al ows it to be carried over uneven floor surfaces and to automaticall adjust itself to them during its progress through the sand. These are also important features in my device.

I claim:

1. In a machine of the character described, the combination therein of, a chassis, a drum rotatably mounted therein, sharply pitched helical blades upon and about the outer parts of the drum for a desired distance toward its center, and arranged in a manner to allow them to engagi and cast material below them toward the Icenter of the path of travel of the chassis, a plural series of fingers extending outwardly from the drum between said blades, means to retain said fingers in resilient position, mechanism in the chassis arranged to transmit power from a source therein to allow one rear wheel thereof to be rotated at a desired speedand mechanism in the chassis arranged to transmit power independently from the same source to allow said drum to be rotated at a desired speed differing from that of the chassis, for the purposes indicated.

2. ln a machine of the character described, the combination therein of, a chas sis. a drum rotatably mounted therein, sharply pitched helical blades upon and about the outer parts of the drum for a dcsircd distance toward its center, and ar ranged in a manuel' to allow them to engage and cast material below them toward the center of the path of travel of the chassis. a plural series of lingers extending outwardly from the'drum between said blades, means to retain said fingers in resilient position. and mechanism in the chassis whereby power may be transmitted from a source in the chassis to allow said drum to be ro tated at a desired speed, for the purposes indicated.

3. In a machine of the character de scribed, the combination therein of, a chassis, a drum rotatably mounted therein, sharply pitched helical blades upon and about the outer parts of the drum for a desired distance toward its center, and arranged in a manner to allow them to engage and cast material below them toward the center of the path of travel of the chassis, for'the purposes indicated.

4. In a machine of the character described, the combination therein ef, a chassis, a drum rotatabl mounted therein, sharply pitched helical blades upon and about the outer parts of the drum for a desired distance toward its center, and arranged in a manner to allow them to engage and cast material below them toward the center of the path of travel of the chassis, a plural series of fingers extending outwardly from the drum between said blades, means to retain said fingers in resilient position, mechanism in the chassis whereby power may be transmitted from a source 1n the chassis to allow said drum to be rotated at a desired speed, and clutch mechanism arranged to automati cally allow the drum to be released from its engagement with said power transmit ting mechanism when said fingers are pressed toward the drum a pre-determined distance, for the purposes indicated.

5. ln a machine of the character described, the combination therein of, a chassis, having two rear and one forward pivoted steering wheel, and mechanism in the chassis arranged to transmit power from a source therein to allow one rear wheel to be rotated at a desired speed, for the pur poses indicated.

6. In a device of the character described, the combination therein of, a chassis, a frame pivoted in the chassis, a drum rotatably mounted in the frame, supporting wheels rotatably mounted in the frame, and mechanism in the frame to allow the wheels to be positioned in a manner whereby the drum may be carried at a desired heightabove the chassis travel path, for the purposes indicated.

RUSSELL C. STOKES.

Witnesses:

DELIA SMITH WRIGHT, W. L. Sonoras. 

